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5cd16ee9 ME |
1 | #ifndef _ASM_POWERPC_PAGE_H |
2 | #define _ASM_POWERPC_PAGE_H | |
3 | ||
4 | /* | |
5 | * Copyright (C) 2001,2005 IBM Corporation. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
a3ba68f9 KG |
13 | #ifndef __ASSEMBLY__ |
14 | #include <linux/types.h> | |
f78f7ed7 | 15 | #include <linux/kernel.h> |
463baa8a SR |
16 | #else |
17 | #include <asm/types.h> | |
a3ba68f9 | 18 | #endif |
5cd16ee9 | 19 | #include <asm/asm-compat.h> |
47310413 | 20 | #include <asm/kdump.h> |
5cd16ee9 ME |
21 | |
22 | /* | |
e1240122 | 23 | * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages |
ca9153a3 | 24 | * on PPC44x). For PPC64 we support either 4K or 64K software |
5cd16ee9 ME |
25 | * page size. When using 64K pages however, whether we are really supporting |
26 | * 64K pages in HW or not is irrelevant to those definitions. | |
27 | */ | |
e1240122 YT |
28 | #if defined(CONFIG_PPC_256K_PAGES) |
29 | #define PAGE_SHIFT 18 | |
30 | #elif defined(CONFIG_PPC_64K_PAGES) | |
5cd16ee9 | 31 | #define PAGE_SHIFT 16 |
ca9153a3 IY |
32 | #elif defined(CONFIG_PPC_16K_PAGES) |
33 | #define PAGE_SHIFT 14 | |
5cd16ee9 ME |
34 | #else |
35 | #define PAGE_SHIFT 12 | |
36 | #endif | |
37 | ||
38 | #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) | |
39 | ||
41151e77 BB |
40 | #ifndef __ASSEMBLY__ |
41 | #ifdef CONFIG_HUGETLB_PAGE | |
85975387 | 42 | extern bool hugetlb_disabled; |
41151e77 BB |
43 | extern unsigned int HPAGE_SHIFT; |
44 | #else | |
45 | #define HPAGE_SHIFT PAGE_SHIFT | |
46 | #endif | |
47 | #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) | |
48 | #define HPAGE_MASK (~(HPAGE_SIZE - 1)) | |
49 | #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
50 | #define HUGE_MAX_HSTATE (MMU_PAGE_COUNT-1) | |
51 | #endif | |
52 | ||
5cd16ee9 ME |
53 | /* |
54 | * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we | |
55 | * assign PAGE_MASK to a larger type it gets extended the way we want | |
56 | * (i.e. with 1s in the high bits) | |
57 | */ | |
58 | #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) | |
59 | ||
b5666f70 ME |
60 | /* |
61 | * KERNELBASE is the virtual address of the start of the kernel, it's often | |
62 | * the same as PAGE_OFFSET, but _might not be_. | |
63 | * | |
64 | * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET. | |
65 | * | |
37dd2bad KG |
66 | * PAGE_OFFSET is the virtual address of the start of lowmem. |
67 | * | |
68 | * PHYSICAL_START is the physical address of the start of the kernel. | |
69 | * | |
70 | * MEMORY_START is the physical address of the start of lowmem. | |
71 | * | |
72 | * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on | |
73 | * ppc32 and based on how they are set we determine MEMORY_START. | |
74 | * | |
75 | * For the linear mapping the following equation should be true: | |
76 | * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START | |
77 | * | |
78 | * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START | |
79 | * | |
b8394179 | 80 | * There are two ways to determine a physical address from a virtual one: |
37dd2bad KG |
81 | * va = pa + PAGE_OFFSET - MEMORY_START |
82 | * va = pa + KERNELBASE - PHYSICAL_START | |
b5666f70 ME |
83 | * |
84 | * If you want to know something's offset from the start of the kernel you | |
85 | * should subtract KERNELBASE. | |
86 | * | |
87 | * If you want to test if something's a kernel address, use is_kernel_addr(). | |
88 | */ | |
398ab1fc | 89 | |
37dd2bad KG |
90 | #define KERNELBASE ASM_CONST(CONFIG_KERNEL_START) |
91 | #define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET) | |
92 | #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START)) | |
93 | ||
0f890c8d | 94 | #if defined(CONFIG_NONSTATIC_KERNEL) |
37dd2bad | 95 | #ifndef __ASSEMBLY__ |
a3ba68f9 | 96 | |
37dd2bad KG |
97 | extern phys_addr_t memstart_addr; |
98 | extern phys_addr_t kernstart_addr; | |
368ff8f1 | 99 | |
27d11496 | 100 | #if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC32) |
368ff8f1 | 101 | extern long long virt_phys_offset; |
37dd2bad | 102 | #endif |
368ff8f1 SP |
103 | |
104 | #endif /* __ASSEMBLY__ */ | |
37dd2bad | 105 | #define PHYSICAL_START kernstart_addr |
368ff8f1 SP |
106 | |
107 | #else /* !CONFIG_NONSTATIC_KERNEL */ | |
37dd2bad | 108 | #define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START) |
549e8152 PM |
109 | #endif |
110 | ||
368ff8f1 | 111 | /* See Description below for VIRT_PHYS_OFFSET */ |
ffda09a9 SW |
112 | #if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE) |
113 | #ifdef CONFIG_RELOCATABLE | |
368ff8f1 SP |
114 | #define VIRT_PHYS_OFFSET virt_phys_offset |
115 | #else | |
116 | #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START) | |
117 | #endif | |
ffda09a9 | 118 | #endif |
368ff8f1 | 119 | |
549e8152 PM |
120 | #ifdef CONFIG_PPC64 |
121 | #define MEMORY_START 0UL | |
0f890c8d | 122 | #elif defined(CONFIG_NONSTATIC_KERNEL) |
549e8152 PM |
123 | #define MEMORY_START memstart_addr |
124 | #else | |
37dd2bad KG |
125 | #define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE) |
126 | #endif | |
5cd16ee9 | 127 | |
5cd16ee9 | 128 | #ifdef CONFIG_FLATMEM |
67eb5494 | 129 | #define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT)) |
603b8922 MM |
130 | #ifndef __ASSEMBLY__ |
131 | extern unsigned long max_mapnr; | |
132 | static inline bool pfn_valid(unsigned long pfn) | |
133 | { | |
134 | unsigned long min_pfn = ARCH_PFN_OFFSET; | |
135 | ||
136 | return pfn >= min_pfn && pfn < max_mapnr; | |
137 | } | |
138 | #endif | |
5cd16ee9 ME |
139 | #endif |
140 | ||
65d3223a AK |
141 | #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) |
142 | #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) | |
5cd16ee9 | 143 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
e41e53cd ME |
144 | |
145 | #ifdef CONFIG_PPC_BOOK3S_64 | |
146 | /* | |
147 | * On hash the vmalloc and other regions alias to the kernel region when passed | |
148 | * through __pa(), which virt_to_pfn() uses. That means virt_addr_valid() can | |
149 | * return true for some vmalloc addresses, which is incorrect. So explicitly | |
150 | * check that the address is in the kernel region. | |
151 | */ | |
152 | #define virt_addr_valid(kaddr) (REGION_ID(kaddr) == KERNEL_REGION_ID && \ | |
153 | pfn_valid(virt_to_pfn(kaddr))) | |
154 | #else | |
65d3223a | 155 | #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr)) |
e41e53cd | 156 | #endif |
5cd16ee9 | 157 | |
dbc9632a KG |
158 | /* |
159 | * On Book-E parts we need __va to parse the device tree and we can't | |
160 | * determine MEMORY_START until then. However we can determine PHYSICAL_START | |
161 | * from information at hand (program counter, TLB lookup). | |
162 | * | |
27d11496 | 163 | * On BookE with RELOCATABLE && PPC32 |
368ff8f1 | 164 | * |
27d11496 | 165 | * With RELOCATABLE && PPC32, we support loading the kernel at any physical |
368ff8f1 SP |
166 | * address without any restriction on the page alignment. |
167 | * | |
168 | * We find the runtime address of _stext and relocate ourselves based on | |
169 | * the following calculation: | |
170 | * | |
171 | * virtual_base = ALIGN_DOWN(KERNELBASE,256M) + | |
172 | * MODULO(_stext.run,256M) | |
173 | * and create the following mapping: | |
174 | * | |
175 | * ALIGN_DOWN(_stext.run,256M) => ALIGN_DOWN(KERNELBASE,256M) | |
176 | * | |
177 | * When we process relocations, we cannot depend on the | |
178 | * existing equation for the __va()/__pa() translations: | |
179 | * | |
180 | * __va(x) = (x) - PHYSICAL_START + KERNELBASE | |
181 | * | |
182 | * Where: | |
183 | * PHYSICAL_START = kernstart_addr = Physical address of _stext | |
184 | * KERNELBASE = Compiled virtual address of _stext. | |
185 | * | |
186 | * This formula holds true iff, kernel load address is TLB page aligned. | |
187 | * | |
188 | * In our case, we need to also account for the shift in the kernel Virtual | |
189 | * address. | |
190 | * | |
191 | * E.g., | |
192 | * | |
193 | * Let the kernel be loaded at 64MB and KERNELBASE be 0xc0000000 (same as PAGE_OFFSET). | |
194 | * In this case, we would be mapping 0 to 0xc0000000, and kernstart_addr = 64M | |
195 | * | |
196 | * Now __va(1MB) = (0x100000) - (0x4000000) + 0xc0000000 | |
197 | * = 0xbc100000 , which is wrong. | |
198 | * | |
199 | * Rather, it should be : 0xc0000000 + 0x100000 = 0xc0100000 | |
200 | * according to our mapping. | |
201 | * | |
202 | * Hence we use the following formula to get the translations right: | |
203 | * | |
204 | * __va(x) = (x) - [ PHYSICAL_START - Effective KERNELBASE ] | |
205 | * | |
206 | * Where : | |
207 | * PHYSICAL_START = dynamic load address.(kernstart_addr variable) | |
208 | * Effective KERNELBASE = virtual_base = | |
209 | * = ALIGN_DOWN(KERNELBASE,256M) + | |
210 | * MODULO(PHYSICAL_START,256M) | |
211 | * | |
212 | * To make the cost of __va() / __pa() more light weight, we introduce | |
213 | * a new variable virt_phys_offset, which will hold : | |
214 | * | |
215 | * virt_phys_offset = Effective KERNELBASE - PHYSICAL_START | |
216 | * = ALIGN_DOWN(KERNELBASE,256M) - | |
217 | * ALIGN_DOWN(PHYSICALSTART,256M) | |
218 | * | |
219 | * Hence : | |
220 | * | |
221 | * __va(x) = x - PHYSICAL_START + Effective KERNELBASE | |
222 | * = x + virt_phys_offset | |
223 | * | |
224 | * and | |
225 | * __pa(x) = x + PHYSICAL_START - Effective KERNELBASE | |
226 | * = x - virt_phys_offset | |
227 | * | |
dbc9632a KG |
228 | * On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use |
229 | * the other definitions for __va & __pa. | |
230 | */ | |
ffda09a9 | 231 | #if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE) |
368ff8f1 SP |
232 | #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET)) |
233 | #define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET) | |
dbc9632a | 234 | #else |
bdbc29c1 PM |
235 | #ifdef CONFIG_PPC64 |
236 | /* | |
237 | * gcc miscompiles (unsigned long)(&static_var) - PAGE_OFFSET | |
238 | * with -mcmodel=medium, so we use & and | instead of - and + on 64-bit. | |
239 | */ | |
240 | #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) | PAGE_OFFSET)) | |
241 | #define __pa(x) ((unsigned long)(x) & 0x0fffffffffffffffUL) | |
242 | ||
243 | #else /* 32-bit, non book E */ | |
dbc9632a | 244 | #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START)) |
549e8152 | 245 | #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START) |
dbc9632a | 246 | #endif |
bdbc29c1 | 247 | #endif |
5cd16ee9 ME |
248 | |
249 | /* | |
250 | * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, | |
251 | * and needs to be executable. This means the whole heap ends | |
252 | * up being executable. | |
253 | */ | |
16e72e9b DV |
254 | #define VM_DATA_DEFAULT_FLAGS32 \ |
255 | (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ | |
256 | VM_READ | VM_WRITE | \ | |
5cd16ee9 ME |
257 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) |
258 | ||
259 | #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ | |
260 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
261 | ||
262 | #ifdef __powerpc64__ | |
263 | #include <asm/page_64.h> | |
264 | #else | |
265 | #include <asm/page_32.h> | |
266 | #endif | |
267 | ||
268 | /* align addr on a size boundary - adjust address up/down if needed */ | |
f78f7ed7 AK |
269 | #define _ALIGN_UP(addr, size) __ALIGN_KERNEL(addr, size) |
270 | #define _ALIGN_DOWN(addr, size) ((addr)&(~((typeof(addr))(size)-1))) | |
5cd16ee9 ME |
271 | |
272 | /* align addr on a size boundary - adjust address up if needed */ | |
273 | #define _ALIGN(addr,size) _ALIGN_UP(addr,size) | |
274 | ||
51fae6de ME |
275 | /* |
276 | * Don't compare things with KERNELBASE or PAGE_OFFSET to test for | |
277 | * "kernelness", use is_kernel_addr() - it should do what you want. | |
278 | */ | |
57e2a99f BH |
279 | #ifdef CONFIG_PPC_BOOK3E_64 |
280 | #define is_kernel_addr(x) ((x) >= 0x8000000000000000ul) | |
281 | #else | |
51fae6de | 282 | #define is_kernel_addr(x) ((x) >= PAGE_OFFSET) |
57e2a99f | 283 | #endif |
51fae6de | 284 | |
cf9427b8 | 285 | #ifndef CONFIG_PPC_BOOK3S_64 |
41151e77 BB |
286 | /* |
287 | * Use the top bit of the higher-level page table entries to indicate whether | |
288 | * the entries we point to contain hugepages. This works because we know that | |
289 | * the page tables live in kernel space. If we ever decide to support having | |
290 | * page tables at arbitrary addresses, this breaks and will have to change. | |
291 | */ | |
292 | #ifdef CONFIG_PPC64 | |
293 | #define PD_HUGE 0x8000000000000000 | |
294 | #else | |
295 | #define PD_HUGE 0x80000000 | |
296 | #endif | |
c61a8843 PM |
297 | |
298 | #else /* CONFIG_PPC_BOOK3S_64 */ | |
299 | /* | |
300 | * Book3S 64 stores real addresses in the hugepd entries to | |
301 | * avoid overlaps with _PAGE_PRESENT and _PAGE_PTE. | |
302 | */ | |
303 | #define HUGEPD_ADDR_MASK (0x0ffffffffffffffful & ~HUGEPD_SHIFT_MASK) | |
cf9427b8 | 304 | #endif /* CONFIG_PPC_BOOK3S_64 */ |
41151e77 BB |
305 | |
306 | /* | |
307 | * Some number of bits at the level of the page table that points to | |
308 | * a hugepte are used to encode the size. This masks those bits. | |
309 | */ | |
310 | #define HUGEPD_SHIFT_MASK 0x3f | |
311 | ||
5cd16ee9 ME |
312 | #ifndef __ASSEMBLY__ |
313 | ||
5dc1ef85 AK |
314 | #ifdef CONFIG_PPC_BOOK3S_64 |
315 | #include <asm/pgtable-be-types.h> | |
316 | #else | |
2bf59916 | 317 | #include <asm/pgtable-types.h> |
5dc1ef85 | 318 | #endif |
5cd16ee9 | 319 | |
a4fe3ce7 | 320 | |
26a344ae AK |
321 | #ifndef CONFIG_HUGETLB_PAGE |
322 | #define is_hugepd(pdep) (0) | |
323 | #define pgd_huge(pgd) (0) | |
a4fe3ce7 | 324 | #endif /* CONFIG_HUGETLB_PAGE */ |
26a344ae | 325 | |
5cd16ee9 ME |
326 | struct page; |
327 | extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); | |
328 | extern void copy_user_page(void *to, void *from, unsigned long vaddr, | |
329 | struct page *p); | |
330 | extern int page_is_ram(unsigned long pfn); | |
1d54cf2b | 331 | extern int devmem_is_allowed(unsigned long pfn); |
5cd16ee9 | 332 | |
14f966e7 RJ |
333 | #ifdef CONFIG_PPC_SMLPAR |
334 | void arch_free_page(struct page *page, int order); | |
335 | #define HAVE_ARCH_FREE_PAGE | |
336 | #endif | |
337 | ||
a5bba930 | 338 | struct vm_area_struct; |
934828ed AK |
339 | #ifdef CONFIG_PPC_BOOK3S_64 |
340 | /* | |
341 | * For BOOK3s 64 with 4k and 64K linux page size | |
342 | * we want to use pointers, because the page table | |
343 | * actually store pfn | |
344 | */ | |
345 | typedef pte_t *pgtable_t; | |
346 | #else | |
ecb35c39 | 347 | #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC64) |
5c1f6ee9 AK |
348 | typedef pte_t *pgtable_t; |
349 | #else | |
2f569afd | 350 | typedef struct page *pgtable_t; |
5c1f6ee9 | 351 | #endif |
934828ed | 352 | #endif |
2f569afd | 353 | |
659e3505 | 354 | #include <asm-generic/memory_model.h> |
5cd16ee9 | 355 | #endif /* __ASSEMBLY__ */ |
a3286f05 | 356 | #include <asm/slice.h> |
5cd16ee9 | 357 | |
5cd16ee9 | 358 | #endif /* _ASM_POWERPC_PAGE_H */ |